Summary of Material on Electric Drives Covered on July 24, 2019

Seamless discussion of dynamic control and encoder-less operation

What is an Electric-Motor Drive? Harnessing of Wind Energy Hybrid Electric Vehicles

Power Processing Unit Reference Book: First Course on Power Electronics by Ned Mohan, published by MNPERE (See www.MNPERE.com for details).

Introduction to AC Machines Primary AC motor drives Induction motors Permanent Magnet Brushless (Synchronous Motors)

Sinusoidally-distributed Stator Windings

Space Vector to Represent Sinusoidal Distributions At time ‘t’

Space Vectors Representation of Combined Phase Currents and Voltages

Physical interpretation of

Balanced Sinusoidal Steady-State Excitation (Rotor Open-Circuited)

Relation Between Space Vectors and Phasors

Permanent-Magnet AC (PMAC) Drives

Structure of Permanent-Magnet Synchronous Machines

Principle of Operation

Torque Calculation

Similarity Between DC Motor and Brushless DC Motor

Induction Motors: Balanced, Sinusoidal Steady State Operation

Structure

Electrically Open-circuited Rotor

Short-circuiting the Rotor (Rs, Ls,leakage = 0) Transformer Analogy

Induced Voltages in Rotor

Induced Currents in Rotor

Rotor MMF

Slip frequency (fslip) in the rotor circuit

Electromagnetic Torque Production

Torque – Speed Characteristics

Generator Mode

Rotor Leakage Inductance

Per-Phase Equivalent Circuit

Stator Winding Resistance and Leakage Inductance

Characteristics at Rated Voltage and Rated Frequency

Motor Currents, Efficiency, Power Factor As a Function of Load

Induction Motor Speed Control

Operating with

Maintaining

Adjusting Voltage

Capability Below and Above Rated Speed